zabbix-client abruptly closes connection with zabbix server on localhost in squeeze

[Siju George <sgeorge.ml@gmail.com>]

Hi,

I am running

root@zabbix-squeeze:~# dpkg -l |grep zabbix
ii  zabbix-agent                            1:1.8.2-1squeeze2
  network monitoring solution - agent
ii  zabbix-frontend-php                     1:1.8.2-1squeeze2
  network monitoring solution - PHP front-end
ii  zabbix-server-mysql                     1:1.8.2-1squeeze2
  network monitoring solution - server (using MySQL)

with

zabbix-squeeze 2.6.32-5-xen-amd64 #1 SMP Tue Jun 14 12:46:30 UTC 2011
x86_64 GNU/Linux

on AWS with an AMI provided by Rightscale.

These are the repositories I use.

=======
root@zabbix-squeeze:~# cat /etc/apt/sources.list
deb http://mirror.nus.edu.sg/Debian squeeze main contrib non-free
deb-src http://mirror.nus.edu.sg/Debian/ squeeze main contrib non-free

deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free
==========

When I enabled monitoring for localhost on the zabbix-server I get
these error messages in the zabbix-server.log file.

========
 1179:20110826:164531.270 Item [Zabbix Server:agent.ping] error: Got
empty string from [127.0.0.1]. Assuming that agent dropped connection
because of access permissions
==============

Zabbix Agent listens on port 10050

=========
root@zabbix-squeeze:~# netstat -ntpl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address
State       PID/Program name
tcp        0      0 0.0.0.0:25              0.0.0.0:*
LISTEN      1086/master
tcp        0      0 0.0.0.0:10050           0.0.0.0:*
LISTEN      2780/zabbix_agentd
tcp        0      0 0.0.0.0:49858           0.0.0.0:*
LISTEN      494/rpc.statd
tcp        0      0 0.0.0.0:10051           0.0.0.0:*
LISTEN      1120/zabbix_server
tcp        0      0 127.0.0.1:3306          0.0.0.0:*
LISTEN      858/mysqld
tcp        0      0 0.0.0.0:111             0.0.0.0:*
LISTEN      482/portmap
tcp        0      0 0.0.0.0:22              0.0.0.0:*
LISTEN      1101/sshd
tcp6       0      0 :::80                   :::*
LISTEN      463/apache2
tcp6       0      0 :::22                   :::*
LISTEN      1101/sshd
=======================

and the zabbix-agentd configuration is..

=========
root@zabbix-squeeze:~# grep -v "#" /etc/zabbix/zabbix_agentd.conf
Server=localhost
Hostname=localhost
StartAgents=5
DebugLevel=3
PidFile=/var/run/zabbix-agent/zabbix_agentd.pid
LogFile=/var/log/zabbix-agent/zabbix_agentd.log
Timeout=3
=========================

Telneting to localhost port 10050 ends the connection abruptly.

=========
root@zabbix-squeeze:~# telnet localhost 10050
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.
==========================

What could be the trouble?

Thanks

--Siju